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The Effect of Wear Ring Clearance on NPSHR

Recommended reading from the 32nd Pump Users Symposium, 2016 A Short Break In recent weeks, we have discussed how an upgrade to composite wear rings allows you to avoid pump seizure, and therefore reduce the wear ring clearance in your pump. This reduction in clearance increases the Lomakin Effect in the pump and improves pump Read the full article…

Upgrading Pumps With Composite Wear Components

Part 4: Which services, which machines, which parts to upgrade? Review In the first part of this series, we discussed how upgrading your pumps with composite wear parts can help avoid galling and seizing, even when a pump runs dry. Because composite parts do not gall or seize like metal parts, this allows you to Read the full article…

Upgrading Pumps With Composite Wear Components

Part 2: Reduce Clearance–The Lomakin Effect Welcome back to our series on upgrading pumps with composite materials. In part 1, we discussed how using composite materials like Vespel® CR-6100 in your pumps allows you to eliminate the metal-to-metal contact points in the pump and minimize the risk of pump seizure: In the shop during assembly Read the full article…

Upgrading Pumps With Composite Wear Components

Part 1: Minimize the Risk of Pump Seizure Welcome to our series on upgrading pumps with composite materials. Over the next few months, we’ll cover the basics of why and how to use composite materials, specifically DuPont™ Vespel® CR-6100, to make your pumps more reliable, efficient, and safe. Metal Parts Seize Centrifugal pumps contain contact points Read the full article…

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Reduce Shaft Deflection by Upgrading Your Wear Rings

The shaft deflection in your pump directly affects mechanical seal reliability. Reducing wear ring clearance is an easy upgrade to minimize shaft deflection. Consider the faces of your mechanical seals–lapped flat to within one or two light bands of flatness, designed to run with precise alignment and minimal leakage across the faces. Excessive shaft deflection Read the full article…

How Much Money Can You Save Increasing the Efficiency of a 500 kW (700 HP) Pump?

According to a major centrifugal pump OEM, energy consumption accounts for 44% of the life cycle cost of a centrifugal pump. With a multi-stage horizontal pump, improving pump efficiency by using Vespel® CR-6100 can make a significant contribution to reducing this cost. The efficiency improvement from DuPont™ Vespel® CR-6100 results from reduced clearance at the Read the full article…

Vespel® CR-6100 Solutions for Pump Cavitation

Noise. Excessive energy use. Life-shortening pump damage. If you’re experiencing these things, pump cavitation may be the problem. What is Cavitation? Cavitation happens when bubbles form in liquid and then implode. The force created by the implosions can lead to a lot of problems, like excessive vibration, decreased flow rates, damaged impellers and bearing failures. Any Read the full article…

Replace PTFE Mixer and Agitator Bearings with Vespel® CR-6100 for Maximized Performance and Service Life

Mixers and agitators are frequently built with PTFE or filled-PTFE shaft bearings. PTFE-based materials are used because they offer excellent chemical resistance and low friction. Unfortunately, these materials have significant shortcomings in their dimensional stability.
Vespel® CR-6100 offers similar chemical and frictional performance, combined with excellent dimensional stability.

Use DuPont Vespel CR-6100 in Cryogenic Ethane and Methane Pumps

Ethane and methane are the lightest light hydrocarbons. In liquid form, they are most commonly found at cryogenic temperatures down to -160⁰C. The cryogenic temperatures combined with the low viscosity and flashing nature of the products makes cryogenic ethane, methane, and LNG pumps a challenging pump application. Vespel® CR-6100 is an ideal material for wear rings and bearings in cryogenic LNG service.